This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 21 |
| 5 | 39 |
| 6 | 63 |
| 7 | 117 |
| 8 | 273 |
| 9 | 819 |
| 10 | 2067 |
| 11 | 3081 |
| 12 | 6201 |
| 13 | 9243 |
| 14 | 12807 |
| 15 | 14469 |
| 16 | 21567 |
| 17 | 43407 |
| 18 | 48711 |
| 19 | 50877 |
| 20 | 64701 |
| 21 | 89649 |
| 22 | 146133 |
| 23 | 149331 |
| 24 | 163293 |
| 25 | 166491 |
| 26 | 221169 |
| 27 | 340977 |
| 28 | 356139 |
| 29 | 447993 |
| 30 | 489879 |
| 31 | 546819 |
| 32 | 661401 |
| 33 | 663507 |
| 34 | 1022931 |
| 35 | 1143051 |
| 36 | 1165437 |
| 37 | 1548183 |
| 38 | 1639911 |
| 39 | 1640457 |